MTN SELLING PEOPLE DREAMS

I signed up for a data contract with MYN And it stated that it R199 ×24months for 40GB Now today it's the 12th which they normally load my data I get only 20GB, this special was advertised online and I even called Mtn with regards to them ripping me off and giving me only half my data, this is the 2nd month and they are still not loading the correct amount of data MTN stop ripping ur customers off, we are paying u and you are taking us for idiots because you think we will never check on the day you load data. You are going to fix this or else I'm taking this up further